3D Co-ordinate geometry – Cartesian co-ordinates

The system used to create the illusion that you are working in 3d space is called the Cartesian coordinate system, the man who created this method was a French mathematician called Rene Descartes in 1637. He did this to try and merge algebra and Euclidean geometry.

The axes that commonly define the 2 dimensional Cartesian system are a horizontal axis labelled x and a vertical axis labelled y. These axes form the xy plane.The point that they meet is called the origin, labelled O.

The importance of the z axis is that it enables us to locate any point in three-dimensional space; it is called the depth axis.

Here is a diagram with the x,y and z axis on it.



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